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Dynamic Variations in Salinity and Potassium Grade of a Potassium

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Dynamic Variations in Salinity and Potassium Grade of a Potassium www.nature.com/scientificreports OPEN Dynamic variations in salinity and potassium grade of a potassium‑rich brine deposit in Lop Nor basin, China Lichun Ma1*, Kai Wang1,2, Yu Zhang1, Qingfeng Tang3 & Hui Yan4 The Quaternary Lop Nor playa is the largest production base of potassium sulfate in the world. It has a mining history of more than 10 years, and its share in the Chinese potassium sulfate market is about 50% to‑date. In this basin, the high‑salinity potassium‑rich brines are mainly contained in Middle Pleistocene–Holocene glauberite strata. Based on the monitoring of the underground brine table and geochemical analysis, this study reveals variations in the underground brine table and potassium‑ bearing grade before and after large‑scale mining in the Lop Nor potash deposit. The results showed that the underground brine table and potassium sulfate grade decreased by varying degrees over sub‑mineral areas after large‑scale mining. The underground brine table declined by 8.5 m, on average, in the Luobei depression, by 6.4 m in the Tenglong platform and by 1.9 m in the Xinqing platform. However, the potassium‑bearing grade showed the diferent trend. The Tenglong platform had the largest decline with average decreases in layers W1, W2 and W3 of 18.2%, 13.0% and 24.8%, respectively. In the Xinqing platform, the average decrease in layersW2 and W3 were 17.4% and 16.0% respectively. The Luobei depression decreases were relatively small (W1, W2 and W3 decreased 4.3%, 4.2% and 3.1%, respectively). This research provides a theoretical basis for the rational development and sustainable use of the potassium‑rich brines in the Lop Nor basin. Te Lop Nor playa is located in the eastern Tarim Basin (Xinjiang, China) and is a famous Quaternary inland salt lake that is also the largest single liquid deposit of potassium sulfate in the world. Te high-salinity potassium- rich brine is mainly contained in Middle Pleistocene–Holocene glauberite strata. Te SDIC Xinjiang Lop Nor Potash Co., Ltd. (abbreviate: SLNP), founded in 2000, has the exploration and mining rights for the potash deposit. In 2003, SLNP carried out mining tests in the hinterland of Lop Nor basin. At the end of 2005, it reached an annual production capacity of 100,000 tons of potassium sulfate and in 2012, it achieved an annual output of 1.37 million tons. In 2017, it reached 1.5 million tons of production capacity. At present, its share in the Chinese potassium sulfate market is about 50%. Since the discovery of potassium-rich brine deposits in the Lop Nor basin, there has been a lot of research in the area. In the past 30 years, researchers have made great progress in metallogenic conditions and sedi- mentary environment analysis 1–6, ore deposit characteristic and genesis 2,7,8, geochemical characteristics of the potassium-rich brine reservoir body 2,9 and mining process and technology 10–13. However, there are few studies on the dynamic variations in the geochemistry of potassium-rich brine deposits in Lop Nor basin14. In 2006, 2009 and 2010, general exploration of all three sub-mineral areas (Luobei depression, and Tenglong and Xinqing platforms) in Lop Nor basin was carried out. Exploration obtained a large amount of drilling and brine chemistry data, which laid the foundation for this research. Based on the geochemical analysis of diferent ore horizons from the early general exploration reports15–17 and the brine samples and chemical data collected in the mining area in 2017, this study conducted a comprehensive comparison. It revealed the temporal and spatial variations of the brine mineralization and potassium grade in diferent ore horizons before and afer large-scale mining in Lop Nor basin. Our results provide a theoretical basis for the rational development and sustainable use of potassium-rich brines in Lop Nor basin. 1MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Science, Beijing 100037, China. 2China University of Geosciences(Beijing), Beijing 100083, China. 3Beijing Centre for Physical and Chemical Analysis, Beijing 100089, China. 4SDIC Xinjiang Lop Nor Potash Co., Ltd., Hami 839000, China. *email: [email protected] Scientifc Reports | (2021) 11:3351 | https://doi.org/10.1038/s41598-021-82958-y 1 Vol.:(0123456789) www.nature.com/scientificreports/ Figure 1. Simplifed geological map of the Lop Nor area in Xinjiang Province, China. Regional geological background Lop Nor is located at the intersection of the Altun and Beishan tectonic belts in the eastern part of the Tarim platform. Te northern and southern basin boundary is controlled by the Kongque River fault and the Altun fault, respectively13 (Fig. 1). Te regional tectonic environment is complex, the basement is fractured and the inheritance and neotectonic activity are strong. Te fault structure generally restricts the formation and devel- opment of Lop Nor Salt Lake2. Since the end of the Neogene, the Lop Nor area has been controlled by tectonic movement5; it began to settle and gradually developed into the lowest depression of the basin. Glacial meltwater, originating from the Tianshan, Kunlun and Altun Mountains, eventually gathered in the Lop Nor basin 13; the water area once reached 20,000 km2. Terefore, the Lop Nor Lake played an important role as a catchment center of the whole Tarim basin throughout the Quaternary by accumulating a large amount of salt in the basin13. At present, the lake has completely dried up with a salt cover spanning 10,000 km2; the salt deposit is more than 200 m thick. Potassium-rich brines are found in these Quaternary salt strata in the northern Lop Nor basin. Te potassium-rich brine deposit consists of three sub-mineral areas from west to east, including the Xin- qing platform, Luobei depression and Tenglong platform. Te boundary between the sub-mines and the brine reservoir is mainly controlled by faults. According to the fault direction, the system can be roughly divided into three groups: faults in the NNE, faults near the EW and faults in the NEE. Te faults in the NEE are the most developed and include the F4 fault, which is between the Xinqing mining area and the Luobei depression, and the F6 fault, which is the boundary of the Luobei depression and the Tenglong platform 14. Te F1 fault is a regional compression–torsion fault, which passes through the Tenglong mining area and cuts it into two parts, north and south14 (Fig. 1). Luobei depression is located in the middle of the whole mining area. It is about 60 km long from north to south, 32.5 km wide from east to west, and has an area of about 1534 km2 (Fig. 1). Te overall terrain is lower than the Tenglong and Xinqing platforms to the east and west with an average altitude of about 780 m, and the surface is covered by salt crusts. Te thickness of the salt strata ranges from about 30–200 m, and the average thickness is about 100 m. Te salt system tends to thicken from south to north and the thickness also gradually increases from west to east15. Te Tenglong platform is about 70–90 km long from north to south and about 20–25 km wide from east to west with an area of about 1623 km2 (Fig. 1). Te surface is mainly a Yadan landform and the terrain is higher than the Luobei depression, with a maximum altitude of 790 m and a minimum altitude of 780 m (aver- age = 785 m). Te thickness of the salt-bearing strata in the northern part of the Tenglong platform is generally 30–50 m (average = 36 m) with a maximum thickness of 69.6 m. Te thickness gradually increases from north Scientifc Reports | (2021) 11:3351 | https://doi.org/10.1038/s41598-021-82958-y 2 Vol:.(1234567890) www.nature.com/scientificreports/ (12 m) to south (60 m) and from east (20 m) to west (60 m). Te thickness of the salt-bearing strata is generally 5–20 m south of the F1 fault, and gradually increases from south to north (4–12 m) and decreases from east to west with a thick middle area16. Xinqing platform is about 60–80 km long (north–south) and 10–20 km wide (east–west) with an area of about 1447 km2 (Fig. 1). Te surface is mainly a Yadan landform and the terrain is relatively high (highest altitude = 795 m, lowest altitude = 780 m) with an average elevation of 789 m. Te accumulated thickness of the salt-bearing strata in the Xinqing platform is about 30–50 m. It gradually thickens from south to north, as well as west to east17. Te whole Lop Nor playa currently has no surface water system. It mainly receives bedrock fssure water and groundwater recharge from Kuluktag Mountain, Beishan Mountain and the Altun Mountains. It also receives lateral recharge from the eastern Archik Valley, as well as the western Kongque River and Tarim River dry deltas (Fig. 1). Down the regional hydrologic gradient, as groundwater moves from the outer fringes to the center of the playa, its salinity gradually increase, reaching a maximum of roughly 350 g/L. Methods Sampling and analysis. In 2003, SLNP conducted a mining test in the Lop Nor playa. Te underground brine was pumped to the surface through a shaf system, and then transported through a brine channel to the solar pond for salt drying and classifcation. Following an economic feasibility analysis, the current four-layer brine (top to bottom: W1, W2, W3 and W4) was mainly mined within 90 m. However, the amount mined early on was relatively small.
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